The results of the study of the destruction of a model mixture of medical waste (MW) of typical composition and their components in the range of pyrolysis temperature of 400–650 °C are presented. It is shown that during the initial stage of waste heating by the time the temperature reaches 350 °C, 86–88 % of chlorine in the form of hydrogen chloride (HCl) passes into the gas phase. Considered developed and protected by the patent of the Russian Federation scheme of organization of thermal utilization of MW by two-stage pyrolysis with the removal of HCl from the gas stream at the first stage of the process with its subsequent neutralization with an alkaline solution, which significantly reduces the possibility of the formation of dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) in the second stage of pyrolysis, gaseous products in the form of a concentrated gas-vapor mixture are burned at a temperature of 1000–1350 °C, which ensures fire destruction of all the organic components of pyrolysis and environmental safety of exhaust flue gases.

A new plant for the treatment solid municipal waste and melting snow removed from streets and roads. The development relates to the field of recovery of municipal waste by heat treatment.

The proposed methodology for the selection of the optimal design solution of the coastal protection structure, adapted to the specific hydrological, hydraulic and morphological conditions of the river according to an integral indicator, including the reliability of the structure; economic and environmental indicators. Innovative solutions to protect the banks of rivers from erosion, patented in the Russian Federation, decision-making modeling algorithms are presented. The developed theory and methodology for choosing the optimal solution can be implemented on other subsystems.

The sorption properties of chitosan granules – the residual biomass of microalgae Chlorella Sorokiniana – that are formed after the extraction of valuable components from them (lipids, pigments, pectins) are studied. A literature analysis of the use of microalgae, chitosan and materials based on it for the purification of water from various pollutants has been carried out. The technique for obtaining chitosan granules – residual biomass is described, and their sorption properties are studied during the treatment of wastewater from iron(III) ions. The efficiency of wastewater treatment of iron(III) ions by chitosan granules is calculated – residual biomass, which for solutions with an initial concentration of 5 mg/l, it was 88 %. Microstructural studies of the surface of chitosan-residual biomass Chlorella Sorokiniana granules were carried out and their physicochemical and mechanical properties were studied. A comparative analysis of granules with DAK grade coal is given. It is shown that mechanical properties (abrasion, grindability) meet the requirements of GOST R 51641-2000. A technological scheme for the production, use and disposal of chitosan granules-residual biomass of Chlorella Sorokiniana is proposed.

The results of the quantitative analysis of the air composition of the working area performing some gluing-and-finishing and while finishing technological operations are given on the example of leather and footwear production. A scheme for decontamination emissions while obtaining chloroprene monomer, alkaline maturation of latex and stripping of monomer from latex. The analysis of the decontamination process of exhaust gas emissions in the production of chloroprene rubber was carried out. Data on the exhaust gases composition at receipt of chloroprene monomer, alkaline maturation of latex and stripping of non-polymerized latex chloroprene before and after absorption are presented in tabular and graphical form.

The dynamics of adsorption of trichloroethylene from aqueous solutions on active carbons (AC) of the SKD-515, ABG, Purolat-Standart grades, differing in composition, method of preparation, structure and chemical state of the surface, was studied. The operating time of the filtering layer before breakthrough decreases in the series SKD-515> ABG> Purolat-Standart coal, which is caused by the porous structure of the coal and the nature of the oxygen-containing functional groups on the carbon surface. It was also noted that adsorption is influenced by the interaction of TCE with functional groups of the coal surface. The efficiency of TCE adsorption on various active carbons at a constant flow rate was studied. It was shown that a decrease in the flow rate of the solution through the filter increases the dynamic adsorption capacity, which indisputably confirms the pore-diffusion inhibition of mass transfer.

Presents the results of work to determine the optimal conditions for chemical extraction of samples; solutions are described to minimize the loss of the target radionuclide in the process of chemical separation; the factors influencing the completeness of plutonium isotope precipitation were experimentally determined and eliminated.

The structures of disturbed lands and restored plant ecosystems on the open-cut and iron ore deposits are under development. Structures are defined by the mining regions of Russia and the categories of restored ecosystems. The calculations are based on the results of remote sensing.

The application of the method of phyto-testing to determine the hazard class of the waste (waste activated sludge from sludge beds, sawdust from natural acacia wood, beer malt spent, fresh chicken dung, sunflower husk), subjected to storage for several months. The values of the minimum effective (threshold) dilution, which has the effect of inhibiting root growth by 20 %, and the values of medium-effective dilution, inhibiting growth by 50 % compared to distilled water were determined. For sunflower husk and beer malt spent, a contradiction was established between the approved hazard class according to the FCCW and a certain hazard class according to the method of MP 2.1.7.2297-07, which indicates a change in the chemical composition of the waste that has been stored for a long period of time.

In this paper, for the assessment the geochemical state of small rivers we have solved the problem of identification of a mathematical model of self-purification processes in the rivers with low water consumption. The scheme of statistical testing of the model, allowing to create an adequate model of the object on the basis of available experimental data was developed. Finding areas of acceptable values of the model parameters is carried out during the simulation test, which is based on the Monte Carlo method. Sufficient estimation accuracy of the number of tests is obtained using the Laplace integral theorem. Approbation of the proposed scheme is done on the example of the river Tsna as a receiver of treated wastewater of industrial enterprises of Tambov. As a result of the study, the following processes occurring in the river were identified: aerobic oxidation of organic matter, nitrification, denitrification, plankton growth and death, deaeration of water with air oxygen, protein and urea ammonification, ion exchange and others. At the final stage of the study, an assessment of the geochemical state of water in the studied section of the river was carried out, including forecasts of the content of dissolved oxygen in the water.

The results of studies of the integral toxicity of exhaust gases of a diesel engine operating on natural gas and alcohol emulsions are presented. At the same time, the regimes characterizing the specific toxicity of a diesel engine under its operating conditions were determined, and emissions of toxic components on these regimes were determined taking into account their weight coefficients. The results of research specific toxic diesel exhaust toxicity indicators, in accordance with the requirements of UNECE Regulation No. 49, show that when a diesel engine operates on natural gas with exhaust gas recirculation and an ethanol-fuel emulsion, the content of nitrogen oxides (NOx) and carbon dioxide (CO) in the exhaust gases conforms to "EURO 3", particulate matter – "EURO 5", total hydrocarbons (CHx) – "EURO 2". When the diesel engine is running on a methanol-fuel emulsion, the content of NOx, СНx and CO in the exhaust gases complies with the standards "EURO 3", particulate matter – "EURO 5".

Objective difficulties and incorrect use of a single maximum permissible concentration of oil for all soils of Russia are considered. It is more expedient to use regional maximum permissible concentrations (RMPC) of oil in different soils of Russia, taking into account their regional ecological-genetic and ecological-geographical features. RMPC of oil in arid soils of the South of Russia was developed on the basis of violation of their ecosystem functions. Regional MPC of oil in dark chestnut soils (haplic kastanozems) is 0.40 % of oil in soil, chestnut (haplic kastanozems) and light chestnut (haplic kastanozems) – 0.30 %, brown semi-desert (haplic calcisols) – 0.24 %, sandy brown semi-desert (calcaric arenosols) – 0.20 %. The developed RPMCs can be used not only for arid soils in southern Russia, but also for similar arid soils in other regions.